/Engine/Source/Runtime/Engine/Public/StaticMeshResources.h
This is a temporary function to refactor and convert old code, do not copy this as is and try to build your data as SoA from the beginning.
void InitWithDummyData ( [FLocalVertexFactory](API\Runtime\Engine\FLocalVertexFactory) * VertexFactory, uint32 NumVerticies, uint32 NumTexCoords, uint32 LightMapIndex )